The Fundamental Principle of Counting (Leaving Cert Mathematics): Flashcards

Calculates total ways for sequential tasks

$x \times y$ ways

Ways for task1 $\times$ task2 $\times$ ... $\times$ taskn

Visual tool: one box per choice, multiply all

$4 \times 3 = 12$

$11 \times 10 = 110$

$26 \times 9 \times 8 = 1,872$

Multiply routes between consecutive points

Multiply

Multiply the possibilities

Teams, codes, meals, routes, arrangements, probability

Can't repeat if without replacement